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ISSN 1998-9539

X-Ray Diffraction Study of Crystal Structure and Thin Films of Chromium(II) Phthalocyaninate

Aleksandr S. Sukhikh, Darya D. Klyamer, and Tamara V. Basova@
Nikolaev Institute of Inorganic Chemistry, 630090 Novosibirsk, Russia
@Corresponding author E-mail: basova@niic.nsc.ru
 
DOI: 10.6060/mhc191177b
Macroheterocycles 2020 13(1) 13-18

 

Crystal structure of Cr(II) phthalocyaninate (CrPc) was determined by means of single-crystal X-ray diffraction. It was shown that after vacuum sublimation CrPc crystallized as a β-polymorph, which was isostructural to β-poly-
morphs of other metal phthalocyanines. When deposited onto glass substrate by organic molecular beam deposition, CrPc formed thin films with strong preferred orientation, consisting of α-polymorph. It was shown that both β-CrPc powder and α-CrPc films were unstable in air and transformed to Cr(OH)Pc. X-Ray diffraction (XRD) studies showed that β-CrPc polycrystalline powder after storage in air (relative humidity 20 %) began to exhibit the first signs of degradation already in 1 hour, while the first changes in XRD patterns of α-CrPc films became noticeable only after a few days. Annealing of α-CrPc films at 250 °C in air at a relative humidity of 70 % leads to their faster conversion to Cr(OH)Pc, and the resulting films have a high degree of crystallinity.

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